But do something different with it - or, even better, find a novel that's never been animated. Otherwise... what's the point?
OK
Well first of all the 1978 version was a film, and this is a mini series; produced by the BBC, who are far more interested in series, even if mini, than films.
But far more importantly, the 1978 version was produced in 1978.
You and I and all of the other people who have made that argument here are old enough to have seen it in 1978 or reasonably soon afterwards.
A new version is aimed at newer people.
They (The BBC and Netflix,), could, of course, show the old version, but "Hey come and see a 40 year old film with people like Richard Briars in!" has much less selling power than "Hey, come and see a brand new mini series with the latest CGI
(if poorly produced according to several Chrons critics), and featuring people you've actually heard of, like James McAvoy."
Or put another way, you and I, Stephen, ain't their target audience.
And "Do something different with it"?
You've seen the 90 second trailer. What do you want to see that's different? Rocket ships?